unclear compile error for struct with string template

[Oleg B via Digitalmars-d-learn]

and when I minimal fix my libs with this issue compiler fails 
without any output... =(

% gdb dmd
(gdb) run -unittest matrix.d vector.d
Starting program: /usr/bin/dmd -unittest matrix.d vector.d
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff7ec9700 (LWP 29224)]
[Thread 0x7ffff7ec9700 (LWP 29224) exited]

Program received signal SIGSEGV, Segmentation fault.
0x000000000046c39a in ctfeInterpret(Expression*) ()
(gdb) bt
#0  0x000000000046c39a in ctfeInterpret(Expression*) ()
#1  0x0000000000457012 in deduceType(RootObject*, Scope*, Type*, 
Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, 
unsigned long)::DeduceType::visit(TypeInstance*) ()
#2  0x000000000044e304 in deduceType(RootObject*, Scope*, Type*, 
Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, 
unsigned long) ()
#3  0x000000000045224f in deduceType(RootObject*, Scope*, Type*, 
Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, 
unsigned long)::DeduceType::visit(TypeStruct*) ()
#4  0x0000000000455e80 in deduceType(RootObject*, Scope*, Type*, 
Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, 
unsigned long)::DeduceType::visit(Expression*) ()
#5  0x000000000044e32c in deduceType(RootObject*, Scope*, Type*, 
Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, 
unsigned long) ()
#6  0x0000000000458251 in 
TemplateDeclaration::deduceFunctionTemplateMatch(TemplateInstance*, 
Scope*, FuncDeclaration*&, Type*, Array<Expression*>*) ()
#7  0x000000000045caf1 in functionResolve(Match*, Dsymbol*, Loc, 
Scope*, Array<RootObject*>*, Type*, 
Array<Expression*>*)::ParamDeduce::fp(void*, Dsymbol*) ()
#8  0x00000000004dd577 in overloadApply(Dsymbol*, void*, int 
(*)(void*, Dsymbol*)) ()
#9  0x000000000045c401 in functionResolve(Match*, Dsymbol*, Loc, 
Scope*, Array<RootObject*>*, Type*, Array<Expression*>*) ()
#10 0x00000000004e0343 in resolveFuncCall(Loc, Scope*, Dsymbol*, 
Array<RootObject*>*, Type*, Array<Expression*>*, int) ()
#11 0x00000000004d9522 in CallExp::semantic(Scope*) ()
#12 0x00000000004eef56 in ExpInitializer::inferType(Scope*) ()
#13 0x00000000004b08ad in VarDeclaration::semantic(Scope*) ()
#14 0x00000000004c1f7a in DeclarationExp::semantic(Scope*) ()
#15 0x000000000043cd3b in ExpStatement::semantic(Scope*) ()
#16 0x00000000004479a6 in CompoundStatement::semantic(Scope*) ()
#17 0x00000000004e5e2a in FuncDeclaration::semantic3(Scope*) ()
#18 0x0000000000407b28 in Module::semantic3() ()
#19 0x00000000004051bc in tryMain(unsigned long, char const**) ()
#20 0x000000338be21b45 in __libc_start_main (main=0x406e60 
<main>, argc=4, ubp_av=0x7fffffffdc28, init=<optimized out>, 
fini=<optimized out>, rtld_fini=<optimized out>,
     stack_end=0x7fffffffdc18) at libc-start.c:274
#21 0x0000000000402739 in _start ()